How do these three sons manage the expedition?(A) They ask their fathers for advice.(B) They get help from National Geographic staff and Sherpas.(C) They study the diversity of the nation of Nepal.

• 这三位名人之后与当地雪巴人及国家地理频道工作人员携手合作，重新踏上他们父亲在四五十年前走过的足迹。